<template>
  <view class="calendar">
    <view class="wrapper">
      <slot
        name="top"
        :nowMonthText="nowMonthText"
        :pickerMonth="pickerMonth"
        :prevMonth="prevMonth"
        :nextMonth="nextMonth"
      >
        <view class="top">
          <view class="month-box">
            <view class="month-text">
              <view class="uni-input" @tap="pickerMonth">{{
                nowMonthText
              }}</view>
            </view>
            <view class="back-today" @tap="goToday">回到今天</view>
          </view>
          <view class="top-left">
            <view class="icon-arrow arrow-left" @tap="previousFn"></view>
            <view class="icon-arrow arrow-right" @tap="nextFn"></view>
          </view>
        </view>
      </slot>
      <view class="calender-box">
        <view class="head-title">
          <view
            class="head-title-item"
            v-for="v in calenderTitleList"
            :key="v"
            >{{ v }}</view
          >
        </view>
        <!-- 一行显示 -->

        <swiper
          v-if="showType === 1"
          class="row-swiper"
          circular
          :disable-programmatic-animation="true"
          :duration="duration"
          :current="swiperCurrent"
          @change="swipereChangFn"
        >
          <swiper-item
            v-for="(v, index) in calenderRowDaysList"
            :key="index"
            :item-id="v.label"
          >
            <view class="row-days-list">
              <view
                class="days-list-item"
                v-for="(item, i) in v.value"
                :key="`${index}-${i}`"
                :class="{
                  used: item.used,
                }"
              >
                <view
                  class="label"
                  v-if="(isNowMonth && item.isNowMonth) || !isNowMonth"
                  :class="{
                    disabled: item.disabled,
                  }"
                  @tap="clickDay(item)"
                >
                  <view
                    class="text"
                    :class="{
                      'active-item':
                        nowSelectDay && nowSelectDay['time'] === item.time,
                      'active-item--disabled':
                        nowSelectDay &&
                        nowSelectDay['time'] === item.time &&
                        item.disabled,
                      'today-text':
                        item.label === '今' &&
                        nowSelectDay &&
                        nowSelectDay['time'] !== item.time &&
                        !item.disabled,
                    }"
                  >
                    {{ item.label }}
                  </view>
                  <view
                    v-show="!item.disabled && item.state"
                    class="state-item text-state-item"
                  >
                  </view>
                  <view
                    class="item-adjust"
                    v-if="!item.disabled && item.adjust && item.adjust.value"
                    :class="{ 'text-state-leave': item.adjust.value == '1' }"
                  >
                    {{ item.adjust.value == "1" ? "休" : "课" }}
                  </view>
                </view>
              </view>
            </view>
          </swiper-item>
        </swiper>
        <!-- 全行显示 -->
        <swiper
          v-else
          class="all-swiper"
          circular
          :disable-programmatic-animation="true"
          :duration="duration"
          @change="swipereChangFn"
          :current="swiperCurrent"
          :class="{
            'six-height':
              swiperDaysList[0] && swiperDaysList[0].value.length / 7 === 6,
          }"
        >
          <swiper-item
            v-for="(v, index) in swiperDaysList"
            :key="index"
            :item-id="v.label"
          >
            <view class="days-list">
              <view
                class="days-list-item"
                v-for="(item, i) in v.value"
                :key="`${index}-${i}`"
                :class="{
                  used: item.used,
                }"
              >
                <view
                  class="label"
                  v-if="(isNowMonth && item.isNowMonth) || !isNowMonth"
                  :class="{
                    disabled: item.disabled,
                  }"
                  @tap="clickDay(item)"
                >
                  <view
                    class="text"
                    :class="{
                      'active-item':
                        nowSelectDay && nowSelectDay['time'] === item.time,
                      'active-item--disabled':
                        nowSelectDay &&
                        nowSelectDay['time'] === item.time &&
                        item.disabled,
                      'today-text':
                        item.label === '今' &&
                        nowSelectDay &&
                        nowSelectDay['time'] !== item.time &&
                        !item.disabled,
                    }"
                  >
                    {{ item.label }}
                  </view>
                  <view
                    v-show="!item.disabled && item.state"
                    class="state-item"
                  ></view>
                  <view
                    class="item-adjust"
                    v-if="!item.disabled && item.adjust && item.adjust.value"
                    :class="{ 'text-state-leave': item.adjust.value == '1' }"
                  >
                    {{ item.adjust.value == "1" ? "休" : "课" }}
                  </view>
                </view>
              </view>
            </view>
          </swiper-item>
        </swiper>
        <view v-if="!hideArrow" class="arrow-wrapper" @click="showTypeChange">
          <view
            class="arrow-left"
            :class="{ 'arrow-left--up': showType === 0 }"
          ></view>
          <view
            class="arrow-right"
            :class="{ 'arrow-right--up': showType === 0 }"
          ></view>
        </view>
      </view>
      <view class="content">
        <slot :value="nowSelectDay"></slot>
      </view>
    </view>
    <!-- 选择月份 -->
    <uni-popup ref="monthPopup" :type="'bottom'">
      <view class="month-popup-box">
        <view class="month-top">
          <view class="cancel-text" @tap="cancelDateFn">取消</view>
          <view class="ok-text" @tap="sucessDate">完成</view>
        </view>
        <picker-view
          :value="selectValue"
          @change="bindChange"
          class="picker-view"
        >
          <picker-view-column>
            <view class="item" v-for="(item, index) in years" :key="index"
              >{{ item }}年</view
            >
          </picker-view-column>
          <picker-view-column>
            <view class="item" v-for="(item, index) in months" :key="index"
              >{{ item }}月</view
            >
          </picker-view-column>
        </picker-view>
      </view>
    </uni-popup>
  </view>
</template>

<script>
export default {
  props: {
    isNowMonth: {
      //  是否只显示当前月日历值
      type: Boolean,
      default: false,
    },
    limitNowMoth: {
      //  限制只有当月
      type: Boolean,
      default: false,
    },
    showRowType: {
      type: Boolean,
      default: true,
    },
    dateStateList: {
      //  日历中的状态 [{date:'2023/12/1',value:1}]
      type: Array,
      default: () => [],
    },
    dateAdjustList: {
      //  日历中的调课状态 [{date:'2023/12/1',value:1}] 1为休，2为调课
      type: Array,
      default: () => [],
    },
    defaultValue: {
      type: String,
      default: "",
    },
    hideArrow: {
      type: Boolean,
      default: false,
    },
  },
  emits: ["ok", "cancel", "changeMonth"],
  data() {
    const date = new Date();
    const years = [];
    const year = date.getFullYear();
    const months = [];
    const month = date.getMonth() + 1;
    const day = date.getDate();
    for (let i = 1990; i <= date.getFullYear() + 30; i++) {
      years.push(i);
    }
    for (let i = 1; i <= 12; i++) {
      months.push(i);
    }

    return {
      monthValue: [years.findIndex((item) => item === year), month - 1], //  选择月份值
      years,
      year, //当前年
      months,
      month, //  当前月
      day, //  当前日
      selectValue: [], //  月份选择器选中的值
      //  日历
      calenderTitleList: ["一", "二", "三", "四", "五", "六", "日"],
      swiperDaysList: [], //  swiper全行显示列表 0-当月 1-下月 2-上月
      swiperCurrent: 0, //  swiper当前显示索引
      duration: 500, //  动画时长
      calenderRowDaysList: [], //  rowSwiper行显示列表
      nowSelectDay: null, //  当前选中值
      showType: 0, //  0 全部行显示 1，1行显示
      isJust: false, //  是否是校准
    };
  },
  computed: {
    nowMonthText() {
      const [yearIndex, monthIndex] = this.monthValue;
      let str = `${
        this.years[yearIndex]
          ? this.years[yearIndex]
          : this.years[this.years.length - 1]
      }年${this.months[monthIndex]}月`;
      this.$emit("changeMonth", [
        this.years[yearIndex],
        this.months[monthIndex].toString().padStart(2, "0"),
      ]);
      return str;
    },
  },
  watch: {
    showRowType: {
      handler(val) {
        if (val) {
          this.showType = 1;
        } else {
          this.showType = 0;
        }
      },
      immediate: true,
    },
    defaultValue(val) {
      if (val && val !== "") {
        this.nowSelectDay = {
          time: Date.parse(val),
        };
      }
    },
  },

  mounted() {
    this.updateCalender();
  },

  methods: {
    showTypeChange() {
      this.showType = 1 - this.showType;
      // this.goToday();
      this.updateCalender(false);
      this.initCurrent();
    },
    //  点击天数
    clickDay(item) {
      if (item.disabled) return;
      this.nowSelectDay = item;
      this.$emit("ok", this.nowSelectDay);
    },
    pickerMonth() {
      if (this.limitNowMoth) return;
      //  同步当前月份值
      this.selectValue = this.monthValue.map((item) => item);
      this.$refs.monthPopup.open();
    },
    //  选择月份赋值
    bindChange({ target }) {
      this.selectValue = target.value;
    },
    //  选择月份完成
    sucessDate() {
      this.monthValue = this.selectValue.map((item) => item);
      this.updateCalender(false);
      if (this.showType === 1) {
        //  一行显示
        //  默认回到第一项

        this.initCurrent();
      }
      this.$refs.monthPopup.close();
    },
    //  取消选择月份
    cancelDateFn() {
      this.$refs.monthPopup.close();
    },
    swipereChangFn(event) {
      if (this.isJust) return;
      const { currentItemId, current } = event.detail;
      this.swiperCurrent = current;
      switch (currentItemId) {
        case "next":
          this.nextMonth();
          break;
        case "pre":
          this.prevMonth();
          break;
      }
      //  月份改变后定位
      if (this.showType === 0) {
        setTimeout(() => this.initCurrent(), 50);
      } else {
        if (currentItemId === "next") {
          setTimeout(() => this.initCurrent(), 50);
        } else if (currentItemId === "pre") {
          const CalenderDaysList = this.getDayList(
            this.years[this.monthValue[0]],
            this.months[this.monthValue[1]]
          );
          let preArr = this.group(CalenderDaysList, 7);
          setTimeout(() => this.initCurrent(preArr.length - 1), 50);
        }
      }
    },
    //  默认回到第一项
    initCurrent(index = 0) {
      if (index === 0) this.isJust = true;
      this.duration = 0;
      this.swiperCurrent = index;
      setTimeout(() => {
        this.isJust = false;
        this.duration = 500;
      }, 0);
    },
    //  回到今天
    goToday() {
      const { years, year, month, day } = this;
      const nowDayDate = `${year}/${month}/${day}`;

      this.monthValue = [years.findIndex((item) => item === year), month - 1];
      this.updateCalender();
      //  默认点击今天
      this.nowSelectDay = {
        value: day, //  值
        label: "今", //  描述
        disabled: false, //  禁用
        isNowMonth: true,
        date: nowDayDate,
        time: new Date(year, month - 1, day).valueOf(),
        state: this.dateStateList.find((data) => data.date === nowDayDate),
        adjust: this.dateAdjustList.find((data) => data.date === nowDayDate),
      };
      //  生成日历碰到今日会触发，这里注释掉
      // this.$emit("ok", this.nowSelectDay);
    },
    //
    previousFn() {
      if (this.swiperCurrent !== 0) {
        this.swiperCurrent--;
      } else {
        this.swipereChangFn({
          detail: {
            currentItemId: "pre",
            current: 0,
          },
        });
      }
    },
    nextFn() {
      this.swiperCurrent++;
    },
    //  上一月
    prevMonth() {
      this.monthValue = this.monthValue.map((item, index) => {
        if (this.monthValue[1] <= 0 && index == 0) {
          return --item;
        } else if (this.monthValue[1] <= 0 && index == 1) {
          return 11;
        } else if (index === 1) {
          return --item;
        }
        return item;
      });
      this.updateCalender(false);
    },
    //  下一月
    nextMonth() {
      this.monthValue = this.monthValue.map((item, index) => {
        if (this.monthValue[1] >= 11 && index == 0) {
          return item + 1;
        } else if (this.monthValue[1] >= 11 && index == 1) {
          return 0;
        } else if (index === 1) {
          return ++item;
        }
        return item;
      });
      this.updateCalender(false);
    },
    //  更新日历
    updateCalender(updateNowDay = true) {
      const year = this.years[this.monthValue[0]];
      const month = this.months[this.monthValue[1]];
      const preYMArr = this.getMonthV(this.monthValue, 2);
      const nextYMArr = this.getMonthV(this.monthValue);
      const nowCalenderDaysList = this.getDayList(year, month);
      const preCalenderDaysList = this.getDayList(preYMArr[0], preYMArr[1]);
      const nextCalenderDaysList = this.getDayList(nextYMArr[0], nextYMArr[1]);
      if (this.year === year && this.month === month) {
        // 含有（今）年月
        for (let i in nowCalenderDaysList) {
          if (nowCalenderDaysList[i].label === "今" && updateNowDay) {
            this.nowSelectDay = nowCalenderDaysList[i];
            this.$emit("ok", this.nowSelectDay);
            if (this.showType !== 0) {
              this.swiperCurrent = Math.ceil((i * 1 + 1) / 7) - 1;
            }
          }
        }
      }
      if (this.showType === 0) {
        //  全行显示
        this.swiperDaysList = this.limitNowMoth
          ? [
              {
                label: "now",
                value: nowCalenderDaysList,
              }, //  当月
            ]
          : [
              {
                label: "now",
                value: nowCalenderDaysList,
              }, //  当月
              {
                label: "next",
                value: nextCalenderDaysList,
              }, //  下一月
              {
                label: "pre",
                value: preCalenderDaysList,
              },
              //  上一月
            ];
      } else {
        //1 一行
        let nowArr = this.group(nowCalenderDaysList, 7);
        let preArr = this.group(preCalenderDaysList, 7);
        let nextArr = this.group(nextCalenderDaysList, 7);
        this.calenderRowDaysList = this.limitNowMoth
          ? [
              ...nowArr.map((arr) => {
                return { label: "now", value: arr };
              }), //  当月
            ]
          : [
              ...nowArr.map((arr) => {
                return { label: "now", value: arr };
              }), //  当月
              {
                label: "next",
                value: nextArr[0],
              }, //  下月第一行
              {
                label: "pre",
                value: preArr[preArr.length - 1],
              }, //  上月最后一行
            ];
      }
    },
    //  根据当前月份值获取上下年月值
    getMonthV(value, type = 1) {
      let arr = []; //  当前月份
      if (type === 1) {
        //  默认获取下一月
        arr = value.map((item, index) => {
          if (value[1] >= 11 && index == 0) {
            return item + 1;
          } else if (value[1] >= 11 && index == 1) {
            return 0;
          } else if (index === 1) {
            return ++item;
          }
          return item;
        });
      } else {
        //  获取上一月
        arr = value.map((item, index) => {
          if (value[1] <= 1 && index == 0) {
            return --item;
          } else if (value <= 1 && index == 1) {
            return 11;
          } else if (index === 1) {
            return --item;
          }
          return item;
        });
      }
      return [this.years[arr[0]], this.months[arr[1]]];
    },
    //  根据年月获取天数列表
    getDayList(year, month) {
      let list = [];

      const startDate = new Date(year, month - 1, 1);
      const endDate = new Date(year, month, 1);
      const days = (endDate - startDate) / (1000 * 60 * 60 * 24);
      for (let i = 1; i <= days; i++) {
        const dateStr = `${year}/${month}/${i}`;
        let week = new Date(dateStr).getDay();

        if (i === 1) {
          let startIndex = week === 0 ? 6 : week - 1;
          //  上月天数列表
          let prevDays =
            (startDate - new Date(year, month - 2, 1)) / (1000 * 60 * 60 * 24);
          let preList = [];
          let piL = 7 + (startIndex - 7);
          for (let pi = 0; pi < piL; pi++) {
            const preDay = prevDays - piL + pi + 1;
            const date = `${year}/${month - 1}/${preDay}`;
            preList.push({
              value: preDay, //  值
              label: preDay, //  描述
              disabled: true, //  禁用
              isNowMonth: false,
              date,
              time: new Date(date).valueOf(),
              state: this.dateStateList.find((data) => data.date === date),
              adjust: this.dateAdjustList.find((data) => data.date === date),
            });
          }
          list.splice(0, startIndex, ...preList);
        }
        list.push({
          value: i, //  值
          label:
            new Date(year, month - 1, i).valueOf() ===
            new Date(this.year, this.month - 1, this.day).valueOf()
              ? "今"
              : i, //  描述
          disabled: false, //  禁用
          isNowMonth: true,
          date: dateStr,
          time: new Date(year, month - 1, i).valueOf(),
          state: this.dateStateList.find((data) => data.date === dateStr),
          adjust: this.dateAdjustList.find((data) => data.date === dateStr),
        });
      }
      //  补齐
      if (list.length % 7 !== 0) {
        let endIndex = 7 - (list.length % 7);
        //  下月天数列表
        let nextList = [];
        for (let ni = 0; ni < endIndex; ni++) {
          nextList.push({
            value: ni + 1, //  值
            label: ni + 1,
            disabled: true, //  禁用
            isNowMonth: false,
            date: `${year}/${month + 1}/${ni + 1}`,
            time: new Date(year, month, ni + 1).valueOf(),
          });
        }
        list.push(...nextList);
      }
      return list;
    },
    //  单数组分割成等长二维数组
    group(list, len) {
      let index = 0;
      const arr = [];
      while (index < list.length) {
        arr.push(list.slice(index, (index += len)));
      }
      return arr;
    },
  },
};
</script>

<style lang="scss" scoped>
.calendar {
  position: relative;
  background: #fff;
}

.wrapper {
  font-family: PingFangSC-Regular, PingFang SC;
  color: #222;
}
// 顶部
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 32rpx 48rpx 16rpx;

  .title {
    height: 48rpx;
    font-size: 34rpx;
    font-weight: 600;
    color: #222222;
    line-height: 48rpx;
  }
  .parting-line {
    width: 1rpx;
    height: 28rpx;
    background: #666;
    margin: 0 16rpx;
  }
  .month-box {
    display: flex;
    align-items: center;
    line-height: 37rpx;
    font-size: 32rpx;
    color: #333333;
    font-weight: 600;
    .back-today {
      font-size: 24rpx;
      font-weight: 400;
      line-height: 24rpx;
      color: $c-primary;
      margin-left: 12rpx;
    }
  }
  .top-left {
    display: flex;
    align-items: center;
    .icon-arrow {
      width: 28rpx;
      height: 28rpx;
    }
    .arrow-left {
      background: center/100%
        url(#{$img-url}/static/img/free/b-icon-arrow-left.png);
    }
    .arrow-right {
      margin-left: 24rpx;
      background: center/100%
        url(#{$img-url}/static/img/free/b-icon-arrow-right.png);
    }
  }
}
.row-swiper {
  height: 110rpx;
}
.all-swiper {
  height: 450rpx;
  transition: height ease 0.5s;
}
.six-height {
  height: 53 0rpx;
}
.calender-box {
  position: relative;
  padding: 24rpx 24rpx 0;
  // box-shadow: 30vw 5rpx 10rpx rgba($color: #eee, $alpha: 0.4),
  //   -30vw 5rpx 10rpx rgba($color: #eee, $alpha: 0.4);
  z-index: 10;
  .head-title {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    grid-gap: 10rpx;
    margin-bottom: 16rpx;
    &-item {
      width: 90rpx;
      height: 33rpx;
      font-size: 24rpx;
      font-weight: 400;
      color: #888888;
      line-height: 33rpx;
      text-align: center;
    }
  }
  .days-list {
    display: grid;
    height: 100%;
    grid-template-columns: repeat(7, 1fr);
    grid-gap: 10rpx;
    padding-top: 14rpx;
    align-content: stretch;
  }
  .row-days-list {
    display: grid;
    height: 100%;
    grid-template-columns: repeat(7, 1fr);
    grid-gap: 10rpx;
    margin-bottom: 10rpx;
    // align-content: space-around;
    align-content: stretch;
    padding-top: 14rpx;
  }
  .days-list-item {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    width: 100%;
    height: 74rpx;
    font-size: 34rpx;
    font-family: Helvetica;
    color: #222222;
    line-height: 41rpx;
    .label {
      position: relative;
      display: flex;
      flex-direction: column;
      justify-content: flex-start;
      align-items: center;
      .text {
        flex-shrink: 0;
        position: relative;
        width: 62rpx;
        height: 62rpx;
        line-height: 62rpx;
        text-align: center;
      }
    }
    .active-item {
      background-color: #006eff;
      color: #fff;
      border-radius: 50%;
    }
    .today-text {
      color: #006eff;
    }
    .active-item--disabled {
      opacity: 0.5;
    }
    .state-item {
      flex-shrink: 0;
      margin-top: 4rpx;
      width: 10rpx;
      height: 10rpx;
      background: #006eff;
      border-radius: 50%;
    }
    .text-state-item {
      width: 8rpx;
      height: 8rpx;

      background-color: #ff7400;
    }

    .item-adjust {
      position: absolute;
      top: -24rpx;
      right: -6rpx;
      width: 20rpx;
      height: 20rpx;
      font-family: PingFangSC, PingFang SC;
      font-weight: 400;
      font-size: 20rpx;
      color: #666666;
      text-align: right;
      font-style: normal;
    }
    .text-state-leave {
      color: #ff7400;
    }

    .disabled {
      color: #eaeaea;
    }
  }

  .arrow-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50rpx;
    height: 40rpx;
    margin: 10rpx auto;
    .arrow-left {
      width: 20rpx;
      height: 4rpx;
      background-color: #ddd;
      border-radius: 2rpx 0 0 2rpx;
      transform: rotate(30deg);
      transform-origin: center right;
      transition: transform ease-in 0.3s;
    }
    .arrow-right {
      width: 20rpx;
      height: 4rpx;
      background-color: #ddd;
      border-radius: 0rpx 2rpx 2rpx 0;
      transform: rotate(-30deg);
      transform-origin: center left;
      transition: transform ease-in 0.3s;
    }
    .arrow-left--up {
      transform: rotate(-30deg);
    }
    .arrow-right--up {
      transform: rotate(30deg);
    }
  }
}

.month-popup-box {
  font-size: 30rpx;
  .month-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1rpx solid #ccc;
    padding: 28rpx 32rpx;
    .ok-text {
      font-size: 30rpx;
      color: #006eff;
      line-height: 42rpx;
    }
    .cancel-text {
      color: #999;
      font-size: 30rpx;
      line-height: 42rpx;
    }
  }
  .picker-view {
    width: 100%;
    height: 400rpx;
    text-align: center;
  }
}

:deep(.popup .uni-popup__wrapper.uni-custom.bottom .uni-popup__wrapper-box) {
  max-height: 100vh;
}
</style>

